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Loans and allowance for credit losses - Amortized Cost, Related Allowance and Interest Income of Non-accrual Loans (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Past Due [Line Items] |  |
Beginning of period non-accrual amortized cost |  | $ 25,282
Non-accrual with no related allowance | $ 32,661 |
Non-accrual with related allowance | 18,099 |
Related allowance | 2,550 |
Year to date Interest Income | 816 |
Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Beginning of period non-accrual amortized cost |  | 5,586
Non-accrual with no related allowance | 13,960 |
Non-accrual with related allowance | 2,045 |
Related allowance | 383 |
Year to date Interest Income | 325 |
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Beginning of period non-accrual amortized cost |  | 1,254
Non-accrual with no related allowance | 3,061 |
Non-accrual with related allowance | 992 |
Related allowance | 131 |
Year to date Interest Income | 69 |
Residential real estate | 1-to-4 family mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Beginning of period non-accrual amortized cost |  | 4,585
Non-accrual with no related allowance | 3,048 |
Non-accrual with related allowance | 2,875 |
Related allowance | 84 |
Year to date Interest Income | 22 |
Residential real estate | Residential line of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Beginning of period non-accrual amortized cost |  | 489
Non-accrual with no related allowance | 854 |
Non-accrual with related allowance | 903 |
Related allowance | 31 |
Year to date Interest Income | 72 |
Commercial real estate | Owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Beginning of period non-accrual amortized cost |  | 2,285
Non-accrual with no related allowance | 7,172 |
Non-accrual with related allowance | 776 |
Related allowance | 63 |
Year to date Interest Income | 89 |
Commercial real estate | Non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Beginning of period non-accrual amortized cost |  | 9,460
Non-accrual with no related allowance | 4,566 |
Non-accrual with related allowance | 7,905 |
Related allowance | 1,711 |
Year to date Interest Income | 215 |
Consumer and other |  |
Financing Receivable, Past Due [Line Items] |  |
Beginning of period non-accrual amortized cost |  | $ 1,623
Non-accrual with no related allowance | 0 |
Non-accrual with related allowance | 2,603 |
Related allowance | 147 |
Year to date Interest Income | $ 24 |

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